Plant and Animal Tissues: Cellular Structure and Function
1. Plant Tissues
Plant tissues appear exclusively in cormophyte plants and are divided into two main categories: embryonic (meristematic) and adult tissues.
1.1. Meristematic Tissues
Meristematic tissues originate from undifferentiated embryonic cells and retain their capacity for continuous cell division. They allow the plant to grow continuously, and from them, all adult tissues derive.
Meristematic cells are typically small, have thin cell walls, large nuclei, and few vacuoles. When they divide, one daughter cell remains undifferentiated while the other differentiates into a specialized cell type.
There are two primary types of meristems:
- Primary meristems: Derived directly from embryonic cells. They are responsible for growth in length (elongation)